SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

        X       QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
        -          OF THE SECURITIES AND EXCHANGE ACT OF 1934

                  FOR THE QUARTERLY PERIOD ENDED JUNE 30, 1997

                                       OR

        _       TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                          Commission file number 1-7933

                                 Aon Corporation
                                 ---------------
             (Exact Name of Registrant as Specified in its Charter)


               DELAWARE                                36-3051915
               --------                                ----------
     (State or Other Jurisdiction of                 (IRS Employer
      Incorporation or Organization)                  Identification No.)



  123 N. WACKER DR, CHICAGO, ILLINOIS                    60606
  -----------------------------------                    -----
(Address of Principal Executive Offices)               (Zip Code)

            (312) 701-3000
            --------------
      (Registrant's Telephone Number)


Indicate  by check  mark  whether  the  Registrant:  (1) has filed  all  reports
required to be filed by Section 13 or 15(d) of the  Securities  and Exchange Act
of 1934  during the  preceding  12 months (or for such  shorter  period that the
Registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. YES  X   NO
                                              ---     ---

Number of shares of common stock outstanding:

                                                         No. Outstanding
                Class                                     as of 6-30-97
                -----                                     -------------

        $1.00 par value Common                             167,213,341
(Adjusted to reflect a three-for-two stock
    split payable May 14, 1997 to stock
     holders of record on May 1, 1997)





                                     Part 1
                             Financial Information
                                Aon CORPORATION
            Condensed Consolidated Statements of Financial Position



                       (millions)                                       As of                  As of
Assets                                                              June 30, 1997          Dec. 31, 1996
                                                                 -------------------    -------------------
                                                                  (Unaudited)
                                                                                    
Investments                                            
  Fixed maturities - available for sale                          $          2,903.2      $         2,826.1
  Equity securities at fair value
    Common stocks                                                             435.1                  393.8
    Preferred stocks                                                          378.8                  485.3
  Mortgage loans on real estate                                                24.1                   29.0
  Real estate (net of accumulated depreciation)                                12.0                   17.8
  Policy loans                                                                 58.2                   58.2
  Other long-term investments                                                 150.7                  136.2
  Short-term investments                                                    1,189.0                1,266.3
                                                                 -------------------    -------------------
      Total investments                                                     5,151.1                5,212.8



Cash                                                                        1,331.6                  410.1


Receivables
  Insurance brokerage and consulting
   services                                                                 4,564.3                3,565.9
  Premiums and other                                                        1,214.2                  989.3
  Accrued investment income                                                    67.2                   69.2
                                                                 -------------------    -------------------
      Total receivables                                                     5,845.7                4,624.4





Deferred Policy Acquisition Costs                                             570.0                  598.8
Cost of Insurance and Renewal Rights Purchased                                531.9                  537.5
Excess of Cost over Net Assets Purchased                                    2,195.9                1,060.2
Property and Equipment at Cost (net of                                        441.0                  323.2
  accumulated depreciation)
Assets Held Under Special Contracts                                            85.7                   87.3
Other Assets                                                                1,254.0                  868.4

                                                                 -------------------    -------------------
      Total Assets                                               $         17,406.9     $         13,722.7
                                                                 ===================    ===================




                                                                         As of                  As of
Liabilities and Equity                                               June 30, 1997          Dec. 31, 1996
                                                                 -------------------    -------------------
                                                                  (Unaudited)
Policy Liabilities
  Future policy benefits                                         $          1,080.3     $          1,079.4
  Policy and contract claims                                                  835.4                  840.9
  Unearned and advance premiums                                             2,017.2                1,925.2
  Other policyholder funds                                                    678.9                  514.1
                                                                 -------------------    -------------------
      Total policy liabilities                                              4,611.8                4,359.6

General Liabilities
  Insurance premiums payable                                                5,775.2                4,143.7
  Commissions and general expenses                                            976.5                  776.8
  Short-term borrowings                                                       479.3                  213.4
  Notes payable                                                               621.6                  475.1
  Debt guarantee of ESOP                                                       46.1                   46.1
  Liabilities held under special contracts                                     85.7                   87.3
  Other liabilities                                                         1,143.2                  737.8
                                                                 -------------------    -------------------
      Total Liabilities                                                    13,739.4               10,839.8

Commitments and Contingent Liabilities
Redeemable Preferred Stock                                                     50.0                   50.0

Company-obligated Mandatorily Redeemable
  Preferred Capital Securities of Subsidiary
  Trust holding solely the Company's Junior
  Subordinated Debentures                                                     800.0                    -

Stockholders' Equity
  Preferred stock - $1 par value                                                5.5                    5.5
  Common stock - $1 par value                                                 171.1                  114.1
  Paid-in additional capital                                                  450.3                  475.4
  Net unrealized investment gains                                             159.2                  153.1
  Net foreign exchange gains/(losses)                                         (46.1)                   1.0
  Retained earnings                                                         2,354.0                2,356.8
  Less - Treasury stock at cost                                              (100.9)                (121.5)
         Deferred compensation                                               (175.6)                (151.5)
                                                                 -------------------    -------------------
      Total Stockholders' Equity                                            2,817.5                2,832.9

                                                                 -------------------    -------------------
      Total Liabilities and Equity                               $         17,406.9     $         13,722.7
                                                                 ===================    ===================

<FN>
See the accompanying notes to the condensed consolidated financial statements.
</FN>


                                     - 2 -



                                 Aon CORPORATION
                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (Unaudited)

(millions except per share data)

                                                                        Second Quarter Ended               Six Months Ended
                                                                     ---------------------------     ---------------------------

                                                                        June 30,       June 30,         June 30,      June 30,
                                                                          1997           1996             1997          1996
                                                                     ------------   ------------     ------------   ------------
                                                                                                                
Revenue
   Brokerage commissions and fees ..............................     $     885.0    $     445.5      $   1,726.7    $     913.5
   Premiums earned .............................................           408.9          381.3            793.3          759.3
   Net investment income .......................................           117.6           92.6            233.4          177.3
   Realized investment gains ...................................               -              -              2.4              -
   Other income ................................................            13.0           13.0             23.0           24.4
                                                                     ------------   ------------     ------------   ------------
       Total revenue earned ....................................         1,424.5          932.4          2,778.8        1,874.5
                                                                     ------------   ------------     ------------   ------------

Benefits and Expenses
   Commissions and general expenses ............................           922.3          524.6          1,811.7        1,054.0
   Benefits to policyholders ...................................           215.6          192.8            420.8          378.8
   Interest expense ............................................            15.9           10.1             30.6           19.3
   Amortization of deferred policy acquisition costs ...........            58.4           55.0            111.9          108.1
   Amortization of intangible assets ...........................            33.4           18.4             64.7           37.2
   Special charges .............................................            27.0           30.2            172.0           30.2
                                                                     ------------   ------------     ------------   ------------
       Total benefits and expenses .............................         1,272.6          831.1          2,611.7        1,627.6
                                                                     ------------   ------------     ------------   ------------

Income from Continuing Operations Before
   Income Tax and Minority Interest ............................           151.9          101.3            167.1          246.9
      Provision for income tax .................................            57.0           36.0             62.7           85.1
                                                                     ------------   ------------     ------------   ------------

Income from Continuing Operations Before
   Minority Interest ...........................................     $      94.9    $      65.3      $     104.4    $     161.8
      Minority Interest - 8.205% mandatorily redeemable
         preferred capital securities ..........................           (10.7)             -            (19.5)             -
                                                                     ------------   ------------     ------------   ------------

Income from Continuing Operations ..............................            84.2           65.3             84.9          161.8

Discontinued Operations:
Income from discontinued operations, net of tax ................               -              -                -           22.4
Gain on disposal of discontinued operations, net of tax ........               -           21.0                -           21.0

                                                                     ============   ============     ============   ============
Net Income .....................................................     $      84.2    $      86.3      $      84.9    $     205.2
                                                                     ============   ============     ============   ============

Net Income Available for Common Stockholders (1) ...............     $      80.9    $      81.2      $      78.2    $     195.0
                                                                     ============   ============     ============   ============

Per Share: (2)
Income from continuing operations (1) ..........................     $      0.48    $      0.36   $         0.46    $      0.92
Income from discontinued operations ............................               -              -                -           0.13
Gain on disposal of discontinued operations ....................               -           0.13                -           0.13
                                                                     ============   ============     ============   ============
Net income (1) .................................................     $      0.48    $      0.49   $         0.46    $      1.18
                                                                     ============   ============     ============   ============

Cash dividends paid on common stock (2) ........................     $      0.26    $      0.24      $      0.50    $      0.47
                                                                     ============   ============     ============   ============

Average common and common equivalent shares outstanding (2) ....           169.3          164.7            169.2          164.7
                                                                     ------------   ------------     ------------   ------------
<FN>
(1)  Includes the effect of $3.3 million and $6.7 million of dividends  incurred
     on the 8% and redeemable preferred stock and $5.1 million and $10.2 million
     of dividends incurred on 8%, 6.25% and redeemable preferred stock in second
     quarter and six months ended June 30, 1997 and 1996, respectively.

(2)  Reflects the three-for-two stock split on May 14, 1997.

See the accompanying notes to the condensed consolidated financial statements.
</FN>


                                     - 3 -



                                 Aon CORPORATION


                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)



                                                                                         Six Months Ended
                                                                                ----------------------------------
                                                                                   June 30,            June 30,
(millions)                                                                           1997                1996
                                                                                --------------      --------------

                                                                                                        
Cash Provided by Operating Activities .......................................   $       294.3       $       297.4
                                                                                --------------      --------------
Cash Flows from Investing Activities:
     Sale (purchase) of short term investments-net ..........................           285.5              (634.6)
     Sale or maturity of fixed maturities
       Available for sale -   Maturities ....................................            61.3                78.7
                              Calls and prepayments .........................            72.9               130.8
                              Sales .........................................           526.6               439.4
     Sale of equity  investments ............................................           639.1               301.3
     Sale or maturities of other investments ................................            32.9                41.0
     Purchase of fixed maturities - available for sale ......................          (757.9)             (984.6)
     Purchase of equity investments .........................................          (655.8)             (293.0)
     Purchase of other investments ..........................................           (38.1)             (154.4)
     Disposition (acquisition) of subsidiaries ..............................        (1,288.8)            1,273.9
     Acquired fiduciary funds from Alexander & Alexander Services, Inc.......           734.0                   -
     Property and equipment and other .......................................           (28.7)              (35.1)
                                                                                --------------      --------------
                              Cash Provided (Used) by Investing Activities ..          (417.0)              163.4
                                                                                --------------      --------------

Cash Flows from Financing Activities:
     Treasury stock transactions - net ......................................            21.9               (27.9)
     Issuance (repayment) of short-term borrowings - net ....................           258.0              (262.9)
     Sale of mandatorily redeemable preferred capital securities ............           800.0                   -
     Repayment of long-term debt ............................................           (71.8)               (2.4)
     Interest sensitive life, annuity and investment contract deposits ......           154.1               348.2
     Interest sensitive life, annuity and investment contract withdrawals ...            (6.8)             (427.1)
     Retirement of preferred stock ..........................................               -               (14.2)
     Cash dividends to stockholders .........................................           (88.9)              (86.3)
                                                                                --------------      --------------
                              Cash Provided (Used) by Financing Activities ..         1,066.5              (472.6)
                                                                                --------------      --------------

Effect of Exchange Rate Changes on Cash .....................................           (22.3)                  -
Increase (Decrease) in Cash .................................................           921.5               (11.8)
Cash at Beginning of Period .................................................           410.1               115.3
                                                                                --------------      --------------
Cash at End of Period .......................................................         1,331.6               103.5
                                                                                ==============      ==============
<FN>

See the accompanying notes to condensed consolidated financial statements
</FN>


                                     - 4 -

            NOTES TO THE CONDENSED CONSOLIDATED FINANCIAL STATEMENTS


1.       Statement of Accounting Principles
         ----------------------------------

         The financial  results included in this report are stated in conformity
         with  generally  accepted  accounting  principles and are unaudited but
         include all normal recurring  adjustments which the Registrant  ("Aon")
         considers  necessary  for a fair  presentation  of the results for such
         periods.  These  interim  figures  are not  necessarily  indicative  of
         results for a full year as further discussed below.

         Refer to the consolidated  financial statements and notes in the Annual
         Report  to  Stockholders  for the  year  ended  December  31,  1996 for
         additional  details  of  Aon's  financial   position,   as  well  as  a
         description  of the  accounting  policies  which  have  been  continued
         without  material  change.  The details  included in the notes have not
         changed  except as a result of normal  transactions  in the interim and
         the events mentioned in the footnotes below.

2.       Stock Split
         -----------

         On March 21, 1997, Aon's board of directors  authorized a three-for-two
         stock split,  payable in the form of a stock  dividend,  of Aon's $1.00
         par value common stock, with approximately 57 million shares payable on
         May 14, 1997. The stock split has not been  retroactively  reflected in
         the December 31, 1996  condensed  statement of  consolidated  financial
         position.  The effect of the stock split was to increase  common  stock
         and decrease additional  paid-in-capital by $57 million. All references
         in the accompanying financial statements to the number of common shares
         and per share amounts have been restated to reflect the stock split.

3.       Statements of Financial Accounting Standards (SFAS)
         ---------------------------------------------------

         In June 1997, the Financial  Accounting  Standards  Board (FASB) issued
         Statement No. 130  (Reporting  Comprehensive  Income) and Statement No.
         131   (Disclosures   about   Segments  of  an  Enterprise  and  Related
         Information). Statement No. 130 establishes standards for reporting and
         classifying   components  of  comprehensive  income  in  the  financial
         statements  and  requires  that  the   accumulated   balance  of  other
         comprehensive income be displayed separately from retained earnings and
         additional  paid-in  capital in the equity  section of a  statement  of
         financial  position.   Statement  No.  131  established  standards  for
         providing  disclosures  related to products  and  services,  geographic
         areas, and major customers.  Aon anticipates  adopting these statements
         in its 1998 financial  statements as required.  Implementation of these
         Statements is not expected to have a material effect on Aon's financial
         statements.

         In February  1997,  the FASB issued  Statement  No. 128  (Earnings  per
         Share). This Statement changes the standards for computing earnings per
         share (EPS).  Under the new requirements  for calculating  primary EPS,
         the dilutive  effect of stock options will be excluded.  The provisions
         of this  Statement  are to be applied  after  December  15,  1997,  and
         require  retroactive  restatement of all prior periods  presented.  Aon
         anticipates  adopting this statement in its December 31, 1997 financial
         statements  as  required.  Implementation  of  this  Statement  is  not
         expected to have a material effect on Aon's financial statements.

         In first half 1997,  Aon  adopted  Statement  No. 125  (Accounting  for
         Transfers  and  Servicing of Financial  Assets and  Extinguishments  of
         Liabilities) in its financial statements as required. Implementation of
         this  Statement  did not have a  material  effect  on  Aon's  financial
         statements.

                                     - 5 -

4.       Capital Stock
         -------------

         During  first half 1997,  Aon reissued  661,100  shares of common stock
         from treasury for employee  benefit plans.  Aon purchased 56,600 shares
         of its common stock at a total cost of $2.4  million  during first half
         1997. In addition,  Aon reissued 243,100 shares of common stock held in
         connection with business combinations. There were 3.9 million shares of
         common stock held in treasury at June 30, 1997.

5.       Capital Securities
         ------------------

         In January 1997, Aon created Aon Capital A, a statutory business trust,
         for the purpose of issuing  mandatorily  redeemable  preferred  capital
         securities  (capital  securities).  The sole asset of Aon  Capital A is
         $824  million  aggregate   principal  amount  of  Aon's  8.205%  Junior
         Subordinated Deferrable Interest Debentures due January 1, 2027.

         Aon  Capital A issued  $800  million of 8.205%  capital  securities  in
         January 1997. The proceeds from the issuance of the capital  securities
         were used to finance a portion of Aon's  acquisition  of Alexander  and
         Alexander  Services Inc. (A&A).  The capital  securities are subject to
         mandatory redemption on January 1, 2027 or are redeemable in whole, but
         not in  part,  at the  option  of Aon upon the  occurrence  of  certain
         events.  The  capital  securities  are  categorized  on  the  condensed
         consolidated  statement  of  financial  position as  "Company-obligated
         Mandatorily Redeemable Preferred Capital Securities of Subsidiary Trust
         holding  solely the  Company's  Junior  Subordinated  Debentures."  The
         after-tax  interest  incurred on the capital  securities is reported as
         minority   interest  on  the  condensed   consolidated   statements  of
         operations.

6.       Business Combinations
         ---------------------

         In first quarter  1997,  Aon  completed  its  acquisition  of A&A for a
         purchase price of  approximately  $1.2 billion.  The acquisition of A&A
         was  accounted  for by the  purchase  method  and was  financed  by the
         issuance of the capital  securities,  commercial paper, and by internal
         funds.  Results  have been  included  in Aon's  consolidated  financial
         statements since January 1, 1997. While A&A was acquired in early 1997,
         the purchase valuation has not yet been completed. Preliminary purchase
         accounting  liabilities of approximately  $200 million were recorded as
         of June 30, 1997,primarily relating to severance and related costs, and
         the consolidation of real estate space.  Preliminary  intangible assets
         of approximately $1.2 billion were created by the acquisition.

         If the A&A  acquisition  had been  consummated  on January 1, 1996, the
         first half 1996 unaudited proforma  consolidated  results of operations
         would have resulted in total  revenues of  approximately  $2.5 billion,
         income from continuing operations of $172 million ($0.86 per share) and
         net income of $215 million ($1.12 per share).

         Pro forma financial information presented is not necessarily indicative
         either of  results of  operations  that  would  have  occurred  had the
         acquisition  been effective on January 1, 1996, or of future results of
         the   operations   of  Aon.  In   addition,   the  effect  of  one-time
         restructuring and investment losses recognition  charges related to the
         A&A  acquisition  are not reflected in the proforma 1996 results above.
         These  restructuring and investment losses charges have been reflected
         in first half 1997 (see note 7).

                                     - 6 -


7.       Special Charges
         ---------------

         In second  quarter 1997,  Aon recorded  pretax  special  charges of $27
         million  ($16.9  million  after-tax  or $0.10 per  share) to  recognize
         investment  losses  incurred  at  A&A  before  Aon  acquired  A&A.  Aon
         discovered in the second quarter that A&A's investment portfolio, as it
         had been constructed before Aon's acquisition, contained certain highly
         volatile   securities  with   previously   unrecognized   losses.   Aon
         immediately  sold those  particular  securities  and  undertook  a full
         financial review into the size and causes of all losses. The review was
         completed early in third quarter 1997 and revealed that A&A's portfolio
         had  included  certain  highly  volatile  securities  (such as  inverse
         floater tranches of  collateralized  mortgage  obligations),  which had
         been incorrectly  classified as high quality money market  instruments.
         At Aon's acquisition date, the carrying value of certain  securities in
         A&A's   portfolio  was  overstated  by  the   previously   unrecognized
         investment losses. These charges were reflected as a separate component
         of total benefits and expenses in the condensed consolidated statements
         of operations.

         In first  quarter 1997,  Aon recorded  pretax  special  charges of $145
         million ($90.6 million after-tax or $0.54 per share), primarily related
         to  management's  commitment  to a formal plan of  restructuring  Aon's
         brokerage  operations  as a result  of the  acquisition  of A&A.  These
         charges were  reflected as a separate  component of total  benefits and
         expenses in the condensed  consolidated  statements of  operations.  In
         connection  with  the  first  quarter  1997  special  charges,  Aon had
         approximately  $110 million  reported in other  liabilities at June 30,
         1997, representing amounts related to the special charges that have not
         yet been paid. Pretax restructuring  charges include approximately $105
         million  associated with real estate activities  including the closure,
         abandonment  and downsizing of various  offices  around the world,  and
         other  consolidation  costs.  The  restructuring   charges  related  to
         consolidating  real  estate  space  are  expected  to be paid  out over
         several  years.  Special  charges  for  severance  and  related  costs,
         involving  over  600  positions,   were   approximately   $40  million.
         Terminations  resulting from  workforce  reductions are planned to take
         place within one year.

         Approximately  2,000 additional  terminations  resulting from workforce
         reductions  are planned to take place  within one year.  Severance  and
         related costs  related to these  workforce  reductions  are included as
         part of the preliminary purchase accounting  liabilities recorded as of
         June 30, 1997 (see note 6).

         In 1996, Aon recorded  pretax  special  charges of $90.5 million ($59.3
         million  after-tax  or $0.36 per share).  In  connection  with the 1996
         special charges,  Aon had  approximately  $60 million reported in other
         liabilities  at June  30,  1997  representing  amounts  related  to the
         special charges that have not yet been paid.

8.       A&A Discontinued Operations
         ---------------------------

         A&A discontinued its insurance underwriting operations in 1985 and sold
         Sphere Drake Insurance Group (Sphere Drake) in 1987. In connection with
         the sale of Sphere  Drake,  A&A  agreed to  provide  indemnites  to the
         purchaser  for  various  potential  liabilities,  including  provisions
         covering  future  losses  on  certain  insurance  pooling  arrangements
         between Sphere Drake and Orion Insurance  Company  (Orion),  a UK based
         insurance company placed in provisional liquidation in 1994, and future
         losses  pursuant to a stop-loss  reinsurance  contract  between  Sphere
         Drake and Lloyds Syndicate 701. The Sphere Drake's sales agreement also
         requires  A&A to  assume  any  losses  in  respect  of the  actions  or
         omissions  by Swann &  Everett  Underwriting  Agency,  an  underwriting
         manangement  company  previously  managed by  Alexander  Howden & Group
         Limited, a subsidiary of A&A.
         
                                     - 7 -
         
         The  net   liabilities  of   discontinued   operations   shown  in  the
         accompanying  condensed  consolidated  statements of financial position
         include insurance  liabilities  associated with the above  indemnities,
         liabilities  of  its  insurance  underwriting   subsidiaries  that  are
         currently  in run-off and its  indemnification  of certain  liabilities
         relating to subsidiares  sold.  Excluded from these  liabilities is A&A
         long-term  debt  related  to  two   reinsurance   contracts  which  are
         associated with the financing of discontinued  operations.  Included in
         Aon's June 30,  1997  condensed  consolidated  statement  of  financial
         position  and  condensed   consolidated   statement  of  operations  is
         long-term  debt of $50  million and  related  interest  expense of $2.3
         million,  respectively. The net liabilities for discontinued operations
         as of June 30, 1997 are composed of the following:
         
(millions)
- --------------------------------------------------------------------------------
Assets:
  Insurance liabilities recoverable under finite risk contracts         $  147
  Reinsurance recoverables                                                  59
  Cash and investments                                                      31
  Other                                                                      9
- --------------------------------------------------------------------------------
Total assets                                                            $  246
- --------------------------------------------------------------------------------
  Liabilities:
  Insurance liabilities                                                 $  275
  Other                                                                     16
- --------------------------------------------------------------------------------
Total liabilities                                                          291
- --------------------------------------------------------------------------------
Total net liabilities of discontinued operations classified 
  as other liabilities                                                  $   45
- --------------------------------------------------------------------------------

         The insurance liabilities represent estimates of future claims expected
         to be made under occurrence-  based insurance  policies and reinsurance
         business covering primarily asbestosis,  environmental  pollution,  and
         latent  disease  risks in the  United  States  which are  coupled  with
         substantial  litigation expenses.  These claims are expected to develop
         and be settled over the next twenty to thirty years.

         Liabilities  stemming  from  these  claims  cannot be  estimated  using
         conventional  actuarial reserving  techniques because of the inadequacy
         of available  historical  experience  to support such  techniques,  and
         because case law, as well as  scientific  standards  for  measuring the
         adequacy  of  site  clean-up  is  still  evolving.   Therefore,   A&A's
         independent actuaries have combined available exposure information with
         other  relevant   industry  data  and  have  used  various   projection
         techniques   to  estimate   the   insurance   liabilities,   consisting
         principally  of  incurred  but not  reported  losses.  A&A has  certain
         protection  against adverse  developments of the insurance  liabilities
         through  several finite risk contracts.  The recoverable  amounts under
         the finite risk contracts represent the excess of such liabilities over
         the retention levels.

         While the  insurance  liabities  set forth above  represent  A&A's best
         estimate of the  probable  loss  amounts,  there is no  assurance  that
         further adverse developments may not occur due to variables inherent in
         the estimation  processes and other matters  described above.  Based on
         independent  actuarial estimates of a range of reasonably possible loss
         amounts,  liabilities could exceed recorded amounts,  subject to offset
         in the event of such adverse  development by way of amounts recoverable
         under the finite risk contracts  referenced  above.  Aon believes that,
         based on current  estimates,  the established  total net liabilities of
         discontinued operations are sufficient to cover A&A's exposure.
         
                                      - 8 -


9.       Contingencies
         -------------
                           
         A&A Contingencies
         -----------------

         A  certain  pending  claim  asserted  against  A&A and  certain  of its
         subsidiaries   allege  that  certain   Alexander  Howden   subsidiaries
         accepted,  on behalf  of  certain  insurance  companies,  insurance  or
         reinsurance  at  premium  levels  not  commensurate  with the  level of
         underwriting risks assumed and retroceded or reinsured those risks with
         financially unsound reinsurance companies. In an action brought in 1988
         against A&A and certain subsidiaries,  plaintiffs seek compensatory and
         punitive  damages,  as well as treble  damages  under RICO totaling $36
         million.  The defendants  have  

         counterclaimed  against  certain of the  plaintiffs  for  contribution.
         Management  of Aon  believes  that A&A has  valid  defenses  to all the
         claims that have been made with respect to these  activities and A&A is
         vigorously  defending the pending action.  This action is covered under
         A&A's professional indemnity program, except for possible damages under
         RICO. Aon currently  believes the  reasonably  possible loss that might
         result  from  this  action,  if any,  would  not be  material  to Aon's
         financial position or results of operations.

         In 1987,  A&A sold  Shand  Morahan  &  Company  (Shand),  its  domestic
         underwriting  management  subsidiary.  Prior to the sale, Shand and its
         subsidiaries  had  provided  underwriting  management  services for and
         placed  insurance  and  reinsurance  with and on behalf of Mutual  Fire
         Marine & Inland Insurance Company (Mutual Fire). Mutual Fire was placed
         in rehabilitation in December 1986. In February 1991, the rehabilitator
         commenced  an action.  The  complaint,  which sought  compensatory  and
         punitive  damages,  alleged that Shand,  and in certain  respects  A&A,
         breached  duties to and agreements with Mutual Fire. On March 27, 1995,
         A&A, Shand and the  rehabilitator  entered into a settlement  agreement
         which  was   approved   by  the   courts  and  which   terminated   the
         rehabilitator's  litigation and released A&A and Shand from any further
         claims by the  rehabilitator.  Under the terms of the  settlement,  A&A
         paid $43.1 million.  Although A&A's professional liability underwriters
         have denied coverage for the Mutual Fire lawsuit,  A&A has instituted a
         declaratory judgment action attempting to validate coverage. On October
         16, 1996, the Court issued a decision  holding that A&A is not entitled
         to  coverage  for the  rehabilitator's  claims.  A&A has  appealed  the
         ruling.

         Under the 1987  agreement  with the  purchaser of Shand,  A&A agreed to
         indemnify the purchaser against certain contingencies, including, among
         others, (i) losses arising out of presale transactions between Shand or
         Shand's  subsidiaries,  on the one hand, and Mutual Fire, on the other,
         and (ii) losses  arising out of presale errors or omissions by Shand or
         Shand's  subsidiaries.  A&A's  obligations  under  the  indemnification
         provisions in the 1987 sales agreement were not limited as to amount or
         duration.

         Starting in late 1992,  the purchaser of Shand has asserted a number of
         claims  under both the Mutual Fire  indemnification  provision  and the
         errors and omissions  indemnification provision of the sales agreement.
         During  1995,  most of  those  claims  were  resolved  by a  series  of
         settlement agreements. Notwithstanding these settlements, which had the
         effect   of   limiting   certain   contractual   obligations   and  the
         restructuring   of   the   parties'   relationship,   some   of   A&A's
         indemnification  provisions  under  the  1987  agreement  are  still in
         effect.  As a result,  there  remains the  possibility  of  substantial
         exposure  to A&A  under  the  indemnification  provisions  of the  1987
         agreement,  although  Aon,  based on current  facts and  circumstances,
         believes that the  possibility  of a material loss resulting from these
         exposures is remote.
         
                              - 9 -
       
         

         Although the ultimate  outcome of these suits cannot be ascertained and
         liabilities  in  indeterminate  amounts  may be  imposed  on A&A or its
         subsidiaries,  on the basis of  present  information,  availability  of
         insurance coverages and advice received from counsel, it is the opinion
         of management  that the disposition or ultimate  determination  of such
         claims  and  lawsuits  will not have a material  adverse  effect on the
         consolidated financial position of Aon.
         
         Other Contingencies
         -------------------

         Aon and its  subsidiaries  are subject to numerous  claims and lawsuits
         that arise in the ordinary course of business.  Some of these cases are
         being  litigated in  jurisdictions  which have judicial  precedents and
         evidentiary  rules which are  generally  believed  to favor  individual
         plaintiffs  against  corporate  defendants.  The  damages  that  may be
         claimed in these and other jurisdictions are substantial,  including in
         many instances claims for punitive or extraordinary  damages.  Accruals
         for these  lawsuits  have been  provided  to the extent that losses are
         deemed probable and are estimable.
         
         
10.      Derivatives and Market Risk Disclosure
         --------------------------------------

         In first quarter 1997,  the Securities  and Exchange  Commission  (SEC)
         issued new rules related to disclosure concerning derivative accounting
         policy  and market  risk  outside  the  financial  statements.  Aon has
         adopted the additional accounting policy disclosures as required in the
         notes to the June 30, 1997  financial  statements  based on a review of
         current  derivatives  and related  accounting  policies as set forth in
         note 11 in the Annual Report for the year ended  December 31, 1996. The
         following  additional  disclosure  references  all material  derivative
         activity that Aon is currently engaged in.

         In most cases,  derivatives  hedging the invested  asset  portfolio are
         hedging the portfolio as a whole. The sale,  maturity or extinguishment
         of a hedged  item  would  not  affect  the  accounting  method  for the
         derivative. The only time the accounting relating to the termination of
         a hedge would differ from the company's  regular  accounting  practices
         would be if the hedge ceases to meet the criteria for hedge accounting.

         The following criteria must be met in order for a derivative to qualify
         for hedge  accounting.  The derivative must be designated as a hedge at
         inception and be consistent with Aon's policy for risk management.  The
         hedged item must have a reliably  measurable  fair value and changes in
         fair value must have the potential to affect future  earnings.  Changes
         in the fair value of the derivative  must be expected to  substantially
         offset changes in the fair value of the designated item attributable to
         the risk being hedged.

         If the criteria for hedge  accounting is not met, the resulting gain or
         loss from the  termination  of the hedge would be realized  through the
         statement of operations in the current period.

                                     - 10 -

                                 Aon CORPORATION
                   MANAGEMENT'S ANALYSIS OF OPERATING RESULTS
                             AND FINANCIAL CONDITION

                      REVENUE AND INCOME BEFORE INCOME TAX
                     FOR SECOND QUARTER AND FIRST HALF 1997


Consolidated Results
- --------------------

Brokerage  commissions  and fees  increased  $439.5  million or 98.7% and $813.2
million or 89% in second quarter and first half 1997,  respectively,  reflecting
primarily  business  combination  activity related to the acquisitions of A&A in
first quarter 1997 and Bain Hogg Group (Bain Hogg) in fourth quarter 1996.

Premiums  earned  increased  $27.6  million  or 7.2% and $34  million or 4.5% in
second quarter and first half 1997, respectively, compared with the same periods
last year. Extended warranty premiums earned increased $30.7 million or 32% in
the quarter reflecting continued growth in both the mechanical and the appliance
and electronic  lines.  There was also  continued  modest growth in direct sales
business.  The planned runoff of North American auto credit  business  partially
offset this increase.

Net investment income increased $25 million or 27% and $56.1 million or 31.6% in
the second  quarter and first half 1997,  respectively,  when  compared to prior
year.  Investment income growth in first half was primarily related to brokerage
acquisitions,  and to income  received  on  certain  private  equity  investment
holdings.  In addition,  net  investment  income from  insurance  brokerage  and
consulting  operations,  primarily relating to fiduciary funds, increased to $38
million in second  quarter 1997 from $17 million in 1996,  and to $77 million in
first half 1997 from $34 million in 1996, primarily due to brokerage acquisition
activity.

Total revenue  increased  $492.1 million or 52.8% and $904.3 million or 48.2% in
the second quarter and first half 1997,  respectively,  largely  attributable to
acquisition-related  growth in  brokerage  commissions  and fees.  Net  realized
investment  gains were $2.4  million in first half 1997.  There were no realized
investment gains in first half 1996. First half 1997 revenue, excluding realized
investment gains, increased 48.1% when compared to prior year.

Benefits  to  policyholders  increased  11.8% or $22.8  million and 11.1% or $42
million in second quarter and first half 1997, respectively, reflecting a higher
volume of new extended warranty business.  This increase was partially offset by
lower claims paid on auto credit  business  that had been in runoff since second
quarter  1996. It is  anticipated  that this business will continue to runoff as
planned.

In second  quarter  1997,  Aon recorded  pretax  special  charges of $27 million
($16.9 million  after-tax) to recognize  investment losses incurred at Alexander
and Alexander  Services,  Inc.  (A&A) before Aon acquired A&A. Aon discovered in
the second quarter that A&A's investment  portfolio,  as it had been constructed
before Aon's  acquisition,  contained  certain highly  volatile  securities with
previously unrecognized losses. Aon immediately sold those particular securities
and  undertook a full  financial  review into the size and causes of all losses.
The review was  completed  early in third  quarter 1997 and revealed  that A&A's
portfolio  had included  certain  highly  volatile  securities  (such as inverse
floater  tranches  of  collateralized  mortgage  obligations),  which  had  been
incorrectly  classified  as high  quality  money  market  instruments.  At Aon's
acquisition  date,  the carrying value of certain securities in A&A's portfolio
was overstated by the previously unrecognized investment losses.

                                     - 11 -

In first  quarter  1997,  Aon recorded  pretax  special  charges of $145 million
($90.6  million   after-tax)  which  were  primarily   related  to  management's
commitment to a formal plan of  restructuring  Aon's  brokerage  operations as a
result of the acquisition of A&A.  Restructuring charges included  approximately
$105  million  associated  with real estate  activities  including  the closure,
abandonment  and  downsizing  of various  offices  around  the world,  and other
consolidation  costs. The  restructuring  charges related to consolidating  real
estate space are expected to be paid out over several years. Special charges for
severance and related costs,  involving over 600 positions,  were  approximately
$40 million.  Terminations  resulting from  workforce  reductions are planned to
take place within one year.

Approximately 2,000 additional  terminations resulting from workforce reductions
are planned to take place within one year.  Severance  and related costs related
to these workforce  reductions are included as part of the preliminary  purchase
accounting liabilities recorded as of June 30, 1997 (see note 6).

In second  quarter 1996, Aon reported  pretax  special  charges of $30.2 million
($19.5 million  after-tax) related to early retirement  programs.  Both the 1997
and 1996  special  charges  were  reflected  as a  separate  component  of total
benefits and expenses in the condensed consolidated statements of operations.

Total benefits and expenses increased $441.5 million or 53.1% and $984.1 million
or 60.5% in the same periods. The increases in the second quarter and first half
expenses reflect the inclusion of pretax special charges of $27 million and $172
million  in second  quarter  and  first  half  1997,  respectively,  related  to
investment  losses incurred at A&A prior to Aon's  acquisition and restructuring
costs  associated  with the merger with A&A, and $30.2 million in second quarter
and first half 1996  related to the  completion  of voluntary  early  retirement
programs.  Total  benefits  and  expenses,  excluding  the 1997 and 1996 special
charges,  increased  55.5% and 52.7% for the second quarter and first half 1997,
respectively, primarily reflecting brokerage acquisition activity. Income before
income tax increased  $50.6 million or 50% in second  quarter 1997 and decreased
$79.8  million or 32.3% in the first half 1997,  respectively,  when compared to
prior year. The decrease in first half pretax earnings reflects the inclusion of
special charges and is offset, in part, by growth in the insurance brokerage and
consulting  segment  following  the A&A and Bain  Hogg  acquisitions.  Excluding
special charges,  income before income tax increased 36% and 22.4% when compared
to second quarter and first half 1996, respectively.


Major Lines of Business
- -----------------------

General
- -------

In the insurance brokerage and consulting  services segment,  Aon reported first
half 1997 pretax special  charges of $145 million  related to the acquisition of
A&A. In second quarter 1997, Aon reported $27 million of pretax special  charges
related to investment losses at A&A in the corporate and other segment. Aon also
reported  second quarter 1996 special  charges of $30.2 million related to early
retirement  programs.  The 1996 special  charges  were  allocated to each of the
major  lines  of  business.  For  purposes  of the  following  line of  business
discussions,  comparisons  against last year's results exclude special  charges.
Cost savings  associated with the integration of similar  businesses  among Aon,
A&A and  Bain  Hogg  began to be  realized  starting  in  second  quarter  1997.
Management  anticipates that the full benefit of cost savings on operations will
be achieved  starting in 1998.  In addition,  references to income before income
tax exclude minority interest.

                                     - 12 -

Insurance Brokerage and Consulting Services
- -------------------------------------------

In first  quarter 1997,  Aon acquired A&A for  approximately  $1.2  billion.  In
fourth  quarter 1996,  Aon acquired  Bain Hogg. As a result,  revenue and income
before income tax results  between  second  quarter and first half 1997 and 1996
are not comparable.

Insurance and other  services  (retail,  reinsurance  and  wholesale  brokerage)
revenue  increased $387.7 million or 99.1% in the second quarter 1997 and $725.6
million or 90.2% for the first  half 1997 when  compared  with the same  periods
last year,  largely due to  acquisition  activity.  Insurance and other services
continued to reflect  highly  competitive  property and casualty  pricing in the
domestic market.

"Consulting"  provides  a full  range  of  employee  benefits  and  compensation
consulting,   specialized   employee  assessment  and  training  programs,   and
administrative  services.  This business showed revenue growth of $73 million or
102.5% and $130.8  million or 91.8% for the second  quarter and first half 1997,
respectively, when compared to prior year, primarily due to acquisition activity
and  to  a  lesser  extent,  expanding  integrated  human  resources  consulting
programs.

Overall,  revenue for the insurance  brokerage and consulting  services  segment
increased  $460.7  million  or 99.7% and  $856.4  million or 90.4% in the second
quarter and first half 1997,  respectively.  Income  before income tax increased
$70.2  million or 122.7% and $93.6  million  or 65.7%  when  compared  to second
quarter and first half 1996, respectively. The brokerage segment continues to be
impacted by a soft property and casualty market, particularly in the reinsurance
brokerage business. Acquisitions accounted for approximately 90-95% of the above
revenue growth in the quarter. Excluding the impact of acquisitions, revenue and
pretax income results related to brokerage core businesses  demonstrated  modest
growth in a very competitive environment.

U.S./International Results
- --------------------------

Second  quarter  U.S.  insurance   brokerage  and  consulting  services  revenue
represents  55% of the  worldwide  total  and  U.S.  income  before  income  tax
represents 49% of the worldwide total. International brokerage revenue of $412
million  increased 200.3% for the second quarter,  primarily  reflecting the A&A
and Bain Hogg  acquisitions.  International  brokerage  income before income tax
increased  385%  for  the  second  quarter   reflecting  the  above  mentioned
acquisition activity.  International  brokerage revenues for risk management and
insurance brokerage services generally are strongest during the first quarter of
the year,  particularly for Continental Europe, while expenses are incurred on a
more even basis throughout the year.

Insurance Underwriting
- ----------------------

The  insurance  underwriting  line of business  provides  direct  sales life and
accident and health  products,  and extended  warranty  products to individuals.
Revenue  increased  $29.7 million or 6.7% and $39 million or 4.4% for the second
quarter and first half 1997, respectively, when compared to prior year primarily
due to growth in the worldwide  extended  warranty lines.  Direct sales business
grew modestly as life business in Europe and the Pacific  continues to runoff as
planned.

Pretax income from  insurance  underwriting  increased  $3.8 million or 5.7% and
$10.1 million or 8.1% in the second  quarter and first half 1997,  respectively,
when compared  with last year.  Overall,  benefit and expense  margins in second
quarter 1997 did not suggest any significant shift in operating  trends.  Direct
sales accident & health business  improved its pretax margin in part due to good
general expense controls and good international

                                     - 13 -


health  product  sales.  Certain  specialty  liability  programs and auto credit
business continued to be profitably run off.

U.S./International Results
- --------------------------

Second  quarter  U.S.  insurance  underwriting  revenue  represents  71%  of the
worldwide  total  and  U.S.  income  before  income  tax  represents  72% of the
worldwide total. U.S. insurance  underwriting income before income tax increased
11.7% in the quarter  when  compared  to its 1996  level.  Results  reflect  the
completed sale of the North American auto credit  underwriting  and distribution
operations in second  quarter 1996 and reflect the planned  continued  runoff of
those operations. International insurance underwriting revenue of $135.3 million
increased  12.6% in the quarter  principally due to growth in premiums earned in
both the direct sales and extended warranty lines.  International  pretax income
decreased 7% in the quarter,  primarily  due to the impact of certain  events in
the extended warranty lines that are not expected to recur in future periods.

Corporate and Other
- -------------------

Revenue in this category  consists  primarily of investment  income on insurance
underwriting  operations'  capital  and  realized  investment  gains.  Insurance
company investment income is allocated to the underwriting  segment based on the
invested assets which underlie policyholder liabilities.  Excess invested assets
and related  investment  income,  which do not underlie these  liabilities,  are
reported  in  this  segment.  Expenses  include  interest  and  other  financing
expenses,   goodwill  amortization   associated  with  insurance  brokerage  and
consulting acquisitions, and corporate administrative costs.

Revenue  increased 6.5% or $1.7 million and 18.9% or $8.9 million for the second
quarter and first half 1997,  respectively,  primarily  due to higher  levels of
investment  income  received  on certain  private  equity  investment  holdings.
Revenue growth was partially  limited by alternative uses of corporate  capital.
Pretax  realized  investment  gains for the first  half 1997 were $2.4  million.
There were no  realized  investment  gains in the second  quarter and first half
1996. Income before income tax, excluding realized  investment gains,  decreased
$26.6  million in the quarter and $44.1  million in the first half over the same
periods  last year.  Contributing  to this  decrease  were  financing  costs and
goodwill amortization related to acquisitions,  in particular A&A and Bain Hogg,
and  additional  interest  expenses on  short-term  debt related to  acquisition
financing.

Discontinued Operations
- -----------------------

Discontinued  operations in first half 1996 were composed principally of capital
accumulation  products and direct response  products.  Substantially  all of the
revenue and income before income tax generated from discontinued  operations was
U.S. These amounts have been segregated as "Income From Discontinued Operations"
in the condensed consolidated  statements of operations.  With the completion of
the sales of The Life  Insurance  Company of Virginia  (LOV) and Union  Fidelity
Life Insurance Company (UFLIC) on April 1, 1996, there were no operating results
from these  discontinued  operations  going forward.  The sales of LOV and UFLIC
resulted  in a $21 million  after-tax  gain on  disposal  which was  recorded in
second quarter 1996.

The discontinued  operations assumed by Aon upon its acquisition of A&A in first
quarter  1997   represent  net   liabilities   related  to  acquired   insurance
underwriting  subsidiaries that are currently in runoff, and  indemnification of
certain  liabilities  relating to subsidiaries sold (see note 8 to the condensed
consolidated  financial  statements).   Aon  believes  that  these  discontinued
operations  are  adequately  reserved for and the net liability is included as a
component of other liabilities on the statement of financial position.

                                     - 14 -



                                 Aon CORPORATION
                             MAJOR LINES OF BUSINESS





                                                                        Second Quarter Ended               Six Months Ended
                                                                     ---------------------------     ---------------------------

                                                                        June 30,       Percent          June 30,       Percent
(millions)                                                                1997         Change             1997         Change
                                                                     ------------   ------------     ------------   ------------
                                                                                                                

Revenue

Insurance brokerage and consulting services ....................     $     923.0           99.7%     $   1,803.7           90.4%

Insurance underwriting .........................................           473.7            6.7            919.1            4.4

Corporate and other ............................................            27.8            6.5             56.0           18.9

                                                                     ------------   ------------     ------------   ------------
       Total revenue                                                 $   1,424.5           52.8%     $   2,778.8           48.2%
                                                                     ============   ============     ============   ============




Income Before Income Tax

Insurance brokerage and consulting services ....................     $     127.4          122.7%     $     236.0           65.7%
      Special charges ..........................................               -              -           (145.0)           N/A
                                                                     ------------   ------------     ------------   ------------
      Including special charges ................................           127.4          266.1             91.0          (24.2)

Insurance underwriting .........................................            70.5            5.7            135.3            8.1

Corporate and other ............................................           (19.0)           N/A            (32.2)           N/A
      Special charges ..........................................           (27.0)           N/A            (27.0)           N/A
                                                                     ------------   ------------     ------------   ------------
      Including special charges ................................           (46.0)           N/A            (59.2)           N/A

                                                                     ------------   ------------     ------------   ------------
       Total income before income tax ..........................     $     151.9           50.0%     $      167.1        (32.3%)
                                                                     ============   ============     ============   ============


                                     - 15 -


                                 Aon CORPORATION
                          REVENUE BY MAJOR PRODUCT LINE





                                                                        Second Quarter Ended               Six Months Ended
                                                                    ---------------------------     ---------------------------

                                                                      June 30,        Percent       June 30,        Percent
(millions)                                                              1997          Change          1997          Change
                                                                    ------------   ------------   ------------   ------------
                                                                                                             
Insurance brokerage and consulting services
Insurance and other services ....................................   $      778.8           99.1%  $    1,530.4           90.2%
Consulting ......................................................          144.2          102.5          273.3           91.8
                                                                    ------------   ------------   ------------   ------------
     Total revenue...............................................   $      923.0           99.7%  $    1,803.7           90.4%
                                                                    ============   ============   ============   ============


Insurance underwriting
Direct sales - life, accident and health ........................   $      259.7            1.0%  $      514.4            0.7%
Extended warranty ...............................................          147.8           28.2          277.2           23.6
Other ...........................................................           66.2           (7.4)         127.5          (12.1)
                                                                    ------------   ------------   ------------   ------------
     Total revenue...............................................   $      473.7            6.7%  $      919.1            4.4%
                                                                    ============   ============   ============   ============


Corporate and other
Investment income on capital and other ..........................   $       27.8            6.5%  $       53.6           13.8%
Realized investment gains .......................................           --             --              2.4           --
                                                                    ------------   ------------   ------------   ------------
     Total revenue...............................................   $       27.8            6.5%  $       56.0           18.9%
                                                                    ============   ============   ============   ============



                                     - 16 -

                NET INCOME FOR SECOND QUARTER AND FIRST HALF 1997


References  to share data  reflect the  three-for-two  stock split  announced on
March 21,  1997,  payable on May 14, 1997.  Second  quarter net income was $84.2
million  ($0.48 per share)  compared to $86.3 million ($0.49 per share) in 1996.
Net income for first half was $84.9 million ($0.46 per share) compared to $205.2
million  ($1.18 per share).  Included in first half 1997 net income is after-tax
realized  investment gains of $0.01 per share with no comparable gains or losses
in 1996.  The  decrease  in first half 1997 net income and the related per share
amount is primarily  influenced by: (1) after-tax 1997 special charges of $107.5
million ($0.64 per share)  compared to after-tax  1996 special  charges of $19.5
million ($0.12 per share); (2) the 1997 deduction for after-tax distributions on
the capital  securities  (reflected  as  "minority  interest"  on the  condensed
consolidated  statements  of  operations);   (3)  operating  results  from  1996
discontinued  operations  due to the completion of the sales of UFLIC and LOV in
second  quarter 1996 ($0.13 per share);  and (4)  after-tax  gain on disposal of
discontinued operations in 1996 ($0.13 per share).

Operating income from continuing operations before special charges, and realized
investment  gains was $101.1 million ($0.58 per share) and $190.9 million ($1.09
per share) in the second quarter and first half 1997, respectively,  compared to
$84.8  million  ($0.48 per share)  and $181.5  million  ($1.04 per share) in the
second quarter and first half 1996, respectively.

The effective  tax rate on continuing  operations  for operating  income,  which
excludes after-tax realized investment gains, was 37.5%, up from 34.5% for first
half 1997 and 1996, respectively, due to changes in business mix. Realized gains
were taxed at 37.5% and 36% for first half 1997 and 1996, respectively.  Average
shares  outstanding for second quarter 1997 increased 2.8% when compared to 1996
primarily  due to the  conversion  of preferred  stock to common stock in fourth
quarter 1996.


                        CASH FLOW AND FINANCIAL POSITION
                          AT THE END OF FIRST HALF 1997


General
- -------

Consistent  with  financial  statement  presentation,  the  following  cash flow
discussion  reflects the  acquisition of A&A in first quarter 1997 and Bain Hogg
in fourth quarter 1996. As a result of these transactions, the amounts contained
in the  condensed  consolidated  statement of cash flows for the first half 1997
are not comparable to the same period in 1996.

Cash flows from operating  activities in first half 1997 were $294.3 million,  a
decrease of $3.1 million from first half 1996. This decrease primarily reflects
the timing of settlement of insurance segment receivables and payables,  as well
as the payments on special  charges and  valuation  adjustments  relating to the
acquisitions of A&A and Bain Hogg.

Investing  activities  used cash of $417 million which was made  available  from
financing and operating  activities.  Cash used for acquisition  activity during
the first half 1997 was $1.3 billion, primarily reflecting the A&A acquisition.

                                     - 17 -

Cash  totaling  $1,066.5  million  was  provided  during  first  half  1997 from
financing  activities.  The increase is primarily a result of funds  provided on
the issuance of the capital securities.  Cash was used to pay dividends of $82.2
million on common  stock,  $5.4  million on 8%  cumulative  perpetual  preferred
stock, and $1.3 million on redeemable preferred stock.

Aon's operating subsidiaries anticipate that there will be adequate liquidity to
meet their needs in the foreseeable future.  Aon's liquidity needs are primarily
for  servicing  its debt and for the payment of  dividends  on stock  issues and
capital securities.  The businesses of Aon's operating  subsidiaries continue to
provide  substantial  positive  cash  flow.  Brokerage  cash  flow has been used
primarily  for  acquisition  financing.  Aon  anticipates  continuation  of  the
company's  positive  cash flow,  the  ability  of the  parent  company to access
adequate short-term lines of credit, and sufficient cash flow in the long-term.

Due to the contractual  nature of its insurance  policyholder  liabilities which
are  intermediate  to long-term in nature,  Aon has invested  primarily in fixed
maturities.  With a carrying  value of $2.9 billion,  Aon's total fixed maturity
portfolio is invested  primarily in investment  grade  holdings  (96%) and has a
fair value which is 103.9% of amortized cost.

Total  assets  increased  $3.7 billion to $17.4  billion  since  year-end  1996,
primarily  due to the  acquisition  of A&A.  Invested  assets  at June 30,  1997
decreased $61.7 million from year-end levels,  primarily due to lower levels of
short-term  investments.  The  amortized  cost  and  fair  value  of  less  than
investment  grade  fixed  maturity  investments,  at June 30,  1997,  were $96.5
million and $104.1  million,  respectively.  The  carrying  value of  non-income
producing  investments in Aon's portfolio at June 30, 1997 was $63.8 million, or
1.2% of total invested assets.

Aon uses derivative financial instruments  (primarily financial futures,  swaps,
options   and   foreign   exchange   forwards)   to:  (a)  manage  its   overall
asset/liability  duration  match;  (b) hedge  asset price risk  associated  with
financial  instruments whose change in value is reported under SFAS 115; and (c)
hedge foreign currency transaction risk and other business risks. As of June 30,
1997, Aon had open contracts which had unrealized gains of  approximately  $18.7
million.

Insurance brokerage and consulting  services  receivables and insurance premiums
payable increased $1 billion and $1.6 billion,  respectively, in first half 1997
when compared to year-end 1996, primarily  reflecting the A&A acquisition.  When
compared to 1996, excess of cost over net assets purchased  (goodwill) increased
approximately $1.1 billion due to the A&A acquisition (see note 6).

In first quarter 1997,  Aon completed the  aquisition of A&A. The purchase price
of  approximately  $1.2 billion was funded by the issuance of commercial  paper,
internal  funds,  and  the  issuance  of  $800  million  of  8.205%  mandatorily
redeemable  preferred  capital  securities  (capital  securities).  The  capital
securities are designated on the condensed  consolidated  statement of financial
position  as   "Company-obligated   Mandatorily   Redeemable  Preferred  Capital
Securities of Subsidiary Trust holding solely the Company's Junior  Subordinated
Debentures."  Short-term  borrowings increased at the end of second quarter 1997
by $265.9 million when compared to year-end 1996,  primarily due to the issuance
of commercial paper for acquisition  financing.  Notes payable  increased at the
end of second  quarter 1997 by $146.5  million when  compared to year-end  1996,
primarily due to  acquisition  financing.  Included in notes payable at June 30,
1997 is approximately $25 million which represents the principal amount of notes
due within one year.

                                     - 18 -

Commencing on or after November 1, 1997, Aon has the option to redeem all or any
part of its 8% Cumulative  Perpetual  Preferred Stock (8% preferred  stock) at a
redemption price of $25.00 per share plus accrued  dividends.  It is anticipated
that Aon will most  likely  exercise  its option to redeem all of the  remaining
outstanding  shares.  At June 30, 1997,  5,446,000  shares of 8% preferred stock
were outstanding.

Stockholders'  equity  decreased  $15.4 million in first half 1997 to $16.04 per
share, a decrease of $0.17 per share since year-end 1996. The principal  factors
influencing this decrease were $107.5 million of after-tax special charges which
reduced net income, net foreign exchange losses of $47.1 million,  and dividends
to  stockholders of $88.9 million.  Partially  offsetting this decrease were net
unrealized investment gains of $6.1 million.


Review by Independent Auditors
- ------------------------------

The condensed  consolidated  financial  statements at June 30, 1997, and for the
second quarter and first half then ended have been reviewed, prior to filing, by
Ernst & Young LLP,  Aon's  independent  auditors,  and their  report is included
herein.

                                     - 19 -

INDEPENDENT ACCOUNTANTS' REVIEW REPORT



Board of Directors and Stockholders
Aon Corporation

We have reviewed the accompanying  condensed consolidated statement of financial
position of Aon  Corporation  as of June 30,  1997,  and the  related  condensed
consolidated  statements of income for the  three-month  and  six-month  periods
ended June 30, 1997 and 1996, and the condensed consolidated  statements of cash
flows for the six-month  periods ended June 30, 1997 and 1996.  These  financial
statements are the responsibility of the Company's management.

We  conducted  our  reviews in  accordance  with  standards  established  by the
American  Institute  of  Certified  Public  Accountants.  A  review  of  interim
financial  information consists principally of applying analytical procedures to
financial  data, and making  inquiries of persons  responsible for financial and
accounting matters. It is substantially less in scope than an audit conducted in
accordance with generally accepted auditing  standards,  which will be performed
for the full year with the  objective of  expressing  an opinion  regarding  the
financial  statements taken as a whole.  Accordingly,  we do not express such an
opinion.

Based on our reviews, we are not aware of any material modifications that should
be made to the accompanying condensed consolidated financial statements referred
to  above  for  them to be in  conformity  with  generally  accepted  accounting
principles.

We have  previously  audited,  in accordance  with generally  accepted  auditing
standards,  the consolidated  statement of financial position of Aon Corporation
as of December  31, 1996,  and the related  consolidated  statements  of income,
stockholders'  equity,  and cash flows for the year then  ended,  not  presented
herein,  and in our report dated  February 11, 1997, we expressed an unqualified
opinion  on  those  consolidated  financial  statements.  In  our  opinion,  the
information set forth in the accompanying  condensed  consolidated  statement of
financial  position as of December 31, 1996, is fairly  stated,  in all material
respects,  in relation to the consolidated  statement of financial position from
which it has been derived.




                                                 ERNST & YOUNG LLP



Chicago, Illinois
August 5, 1997


                                     - 20 -


                                     PART II
                                     -------

                                OTHER INFORMATION
                                -----------------


ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

   (a)   Exhibits  - The  exhibits  filed  with this  report  are  listed on the
         --------
         attached Exhibit Index.

   (b)   Reports on Form 8-K - No Current Reports on Form 8-K were filed for the
         -------------------
         quarter ended June 30, 1997.


                                    SIGNATURE

Pursuant to the  requirements  of the  Securities  and Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.


                                   Aon Corporation
                                   (Registrant)

August 14, 1997                    /s/ Harvey N. Medvin
                                   --------------------
                                   HARVEY N. MEDVIN
                                   EXECUTIVE VICE PRESIDENT,
                                   CHIEF FINANCIAL OFFICER AND
                                   TREASURER
                                   (Principal Financial and Accounting Officer)


                                     - 21 -

                                 Aon CORPORATION
                                 ---------------

                                  EXHIBIT INDEX
                                  -------------



Exhibit Number
In Regulation S-K
                                                                           Page
Item 601 Exhibit Table                                                     No.
- ----------------------                                                     ---

(10) Aon Severance Plan

(11) Statement regarding Computation of Per Share Earnings.

(12) Statements regarding Computation of Ratios.

         (a)      Statement regarding  Computation of Ratio of 
                  Earnings to Fixed Charges.
         (b)      Statement  regarding  Computation  of  Ratio
                  of  Earnings  to Combined Fixed Charges and 
                  Preferred Stock Dividends.

(15) Letter re: Unaudited Interim Financial Information

(27) Financial Data Schedule

                                     - 22 -